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I just checked my phone and I can indeed do that ("3G only"), though if I wanted 4G, the only option is to enable "4G/3G/2G".

• ikeboy 10y ago
  You may be able to disable it through the data settings menu. On sprint it's *#*#data#*#*
  • kire456 10y ago
    For my phone it is *#*#service#*#* then Service Settings in the menu.
    • jakub_g 10y ago
      Indeed, there are more options there, cool!